I am. I was told there was a problem with Mac version 10.4 and asked to show the Java logs. I am trying to figure out how to do that. I reported it under the news section on the home page, after clicking on the link about the upgrade if you want to follow.

I have the same problem. I checked the griddlers help page and they say to use Java 5 to run the puzzles. But as far as I can tell, Mac has only released Java 5 for OS 10.5 and higher (I am running OS 10.4).

I managed to find Java 5.0 for OS10.4 and have installed it, but the griddlers are still not working. When I hit solve, I just get a blank grey window with no puzzle. The only thing that works is the top bar of the window with the counter for the solving time of the puzzle.